#include <iostream>
#include <fstream>
#include <climits>
using namespace std;

ifstream in("ssm.in");
ofstream out("ssm.out");

int n,zero,suma;
int s[6000005];
int main()
{
    in>>n;
    for(int i=1;i<=n;++i){
        in>>s[i];
        s[i]+=s[i-1];
    }
    zero=0;
    suma=INT_MIN;
    for(int i=1;i<=n;++i){
        zero=min(zero,s[i]);
        suma=max(s[i]-zero,suma);
    }
    out<<suma;
    return 0;
}